Isothermal vapour–liquid equilibria in the binary and ternary systems composed of tert-butyl methyl ether, 3,3-dimethyl-2-butanone and 2,2-dimethyl-1-propanol

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Abstract

Vapour–liquid equilibrium data in the three binary tert-butyl methyl ether + 3,3-dimethyl-2-butanone, 3,3-dimethyl-2-butanone + 2,2-dimethyl-1-propanol, tert-butyl methyl ether + 2,2-dimethyl-1-propanol systems, and in the ternary tert-butyl methyl ether + 3,3-dimethyl-2-butanone + 2,2-dimethyl-1-propanol system are reported. The data were measured isothermally at 320.00, 330.00 and 340.00 K covering the pressure range 12–118 kPa. The binary vapour–liquid equilibrium data were correlated using the Wilson and NRTL equations by means of a new algorithm [see J. Pavlíček, I. Wichterle, Fluid Phase Equilib. 260 (2007) 70–73]; resulting parameters were then used for calculation of phase behaviour in the ternary system and for subsequent comparison with experimental data.

Introduction

New results of a continuing project dealing with phase equilibria in mixtures belonging to distinct families of organic compounds are reported in this paper. Vapour–liquid equilibria are determined for three binary and one ternary systems containing alcohol, ketone, and ether. Within the series of papers, the systems of components having a common alkyl group (isopropyl or tert-butyl), namely 2-propanol + diisopropyl ether + 2,2,4-trimethylpentane [1], tert-butanol + 2,2,4-trimethylpentane + 1-tert-butoxy-2-propanol [2], tert-butyl methyl ether + tert-butanol + 2,2,4-trimethylpentane [3], 2-propanol + diisopropyl ether + 1-methoxy-tert-butyl methyl ether [4], 2-propanol + diisopropyl ether + 4-methyl-2-pentanone [5], 2-methylpentane + 3-methyl-2-butanone + 3-methyl-2-butanol [6], 2-propanol + 3-methyl-2-butanone + 2,2,4-trimethylpentane [7] have already been investigated. Compounds used in this paper contain also the ketone, alcohol, and tert-butyl groups, namely tert-butyl methyl ether, 3,3-dimethyl-2-butanone, and 2,2-dimethyl-1-propanol. The new data were measured at the three constant temperature levels, particularly at 320.00, 330.00 and 340.00 K, in order to be consistent with all the previous papers.

Section snippets

Apparatus and procedure

Experimental vapour–liquid equilibrium data were measured in an all glass circulation still chargeable with 150 ml of liquid phase; essentially it was the Dvorak–Boublík type which is quoted in our previous experimental papers (e.g. [7]). The pressure was measured indirectly via the boiling point of water in an ebulliometer connected in parallel to the still; the uncertainty is ±0.1% of the measured value. The equilibrium temperature was determined with the digital thermometer F250 (ASL, United

Results

The direct experimental xyP values together with the activity coefficients, γ1, γ2, and ΔGE (evaluated from the NRTL correlation) for the binary systems are given in Table 1. All three binary systems are zeotropic. The data were correlated using the Wilson and NRTL equation in the forms as follows (expressions for ln γ2 can be easily obtained after interchanging indices 1 and 2):
(1) The Wilson equationlnγ1=1ln(x1+x2A12)x1x1+x2A12x2A21x2+x1A21where A12 = (V1/V2)exp[−(λ12  λ11)/RT], A21 = (V2/V1

Discussion and conclusions

No published vapour–liquid equilibrium data for the studied systems were found in the bibliography covering the period 1888–2007 [16]. Nevertheless, the reliability of both the data and correlation procedure is verified by the fact that the resulting standard deviations are approximately proportional to the magnitudes of input uncertainties. Generally, the inspection of deviation distribution from smoothed data confirms that there are only expectable, random and non-systematic errors.

Acknowledgements

The authors acknowledge the partial support of the Grant Agency of the Czech Republic (Grant No. 104/07/0444).

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